Serum indoleamine 2,3-dioxygenase activity is associated with reduced immunogenicity following vaccination with MVA85A

BMC Infectious Diseases

Helen A Fletcher⁴  Helen McShane⁸  Anna Checkley⁴  Willem Hanekom¹  Greg Hussey³  Hassan Mahomed¹  Tony Hawkridge³  Michelle Tameris¹  Tom Scriba¹  Clare R Sander⁶  Rod Chalk²  Ansar A Pathan⁵  Ellen Miller⁷  Kristina Kakalacheva⁹  Rachel Tanner⁸ 

[1] South African Tuberculosis Vaccine Initiative, Institute of Infectious Disease and Molecular Medicine and School of Child and Adolescent Health, University of Cape Town, Cape Town, South Africa;Structural Genomics Consortium, University of Oxford, Oxford, UK;Vaccines for Africa Initiative, Cape Town, South Africa;Present address: London School of Hygiene and Tropical Medicine, Keppel Street, London, UK;Present address: Centre for Infection, Immunity and Disease Mechanisms, Biosciences, School of Health Sciences and Social Care, Brunel University, Middlesex, UK;Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK;Present address: Royal Sussex County Hospital, Eastern road, Brighton, UK;The Jenner Institute, University of Oxford, Oxford, UK;Present address: Department of Neuroinflammation, Institute of Experimental Immunology, University of Zurich, Zurich, Switzerland

关键词: LC-MS;    Interferon-γ;    BCG;    MVA85A;    Vaccine;    Tuberculosis;    Kynurenine;    Tryptophan;    Indoleamine 2,3-dioxygenase;   

Others  :  1118226
DOI  :  10.1186/s12879-014-0660-7

 received in 2014-04-17, accepted in 2014-11-24,  发布年份 2014

【 摘 要 】

Background

There is an urgent need for improved vaccines to protect against tuberculosis. The currently available vaccine Bacille Calmette-Guerin (BCG) has varying immunogenicity and efficacy across different populations for reasons not clearly understood. MVA85A is a modified vaccinia virus expressing antigen 85A from Mycobacterium tuberculosis which has been in clinical development since 2002 as a candidate vaccine to boost BCG-induced protection. A recent efficacy trial in South African infants failed to demonstrate enhancement of protection over BCG alone. The immunogenicity was lower than that seen in UK trials.

The enzyme Indoleamine 2,3-dioxygenase (IDO) catalyses the first and rate-limiting step in the breakdown of the essential amino acid tryptophan. T cells are dependent on tryptophan and IDO activity suppresses T-cell proliferation and function.

Methods

Using samples collected during phase I trials with MVA85A across the UK and South Africa we have investigated the relationship between vaccine immunogenicity and IDO using IFN-γ ELISPOT, qPCR and liquid chromatography mass spectrometry.

Results

We demonstrate an IFN-γ dependent increase in IDO mRNA expression in peripheral blood mononuclear cells (PBMC) following MVA85A vaccination in UK subjects. IDO mRNA correlates positively with the IFN-γ ELISPOT response indicating that vaccine specific induction of IDO in PBMC is unlikely to limit the development of vaccine specific immunity. IDO activity in the serum of volunteers from the UK and South Africa was also assessed. There was no change in serum IDO activity following MVA85A vaccination. However, we observed higher baseline IDO activity in South African volunteers when compared to UK volunteers. In both UK and South African serum samples, baseline IDO activity negatively correlated with vaccine-specific IFN-γ responses, suggesting that IDO activity may impair the generation of a CD4+ T cell memory response.

Conclusions

Baseline IDO activity was higher in South African volunteers when compared to UK volunteers, which may represent a potential mechanism for the observed variation in vaccine immunogenicity in South African and UK populations and may have important implications for future vaccination strategies.

Trial registration

Trials are registered at ClinicalTrials.gov; UK cohort NCT00427830 webcite, UK LTBI cohort NCT00456183 webcite, South African cohort NCT00460590 webcite, South African LTBI cohort NCT00480558 webcite.

【 授权许可】

   
2014 Tanner et al.; licensee BioMed Central Ltd.

【 图 表 】

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